A COMPREHENSIVE NEWTON RAPHSON FACTS MODEL FOR THE POWER FLOW SOLUTION OF PRACTICAL POWER NETWORKS

Abstract

This paper aimed to give modern (or) new version for STATCOM. And this paper aimed to give power flow solution by using Newton Rapshon method. Old STATCOM model consist of VSC and shunt connected transformer. New STATCOM model consist of VSC and LTC (Load Tap Changer). New VSC consist of tap changing transformer. Transformer primary connected to ac system bus, secondary connected to DC bus. The DC bus draws no current. The magnitude and phase angle to tap changing transformer indicates amplitude modulation and phase shift of PWM inverter. This paper also contains load flow model of UPFC. UPFC controls active power, reactive power and also controls voltage magnitude of bus. The sending and receiving end of the UPFC are decoupled. They are separated by a capacitor in parallel. The sending end acts as PV bus, the receiving end of UPFC acts as PQ bus. The active and reactive power in PQ bus, and voltage magnitude at PV bus are controlled by UPFC. Active power supplied by PV bus is same as PQ bus of UPFC. The UPFC parameter are calculated by Newton – Raphson Method. The original dimensions of the mismatch vector and Jacobion matrix are not attered at all. UPFC will regulates power flow and minimize power losses.